GMC 2007 Acadia Owner's Manual page 503

When the CHANGE ENGINE OIL SOON message
appears, certain services, checks, and inspections
are required. Required services are described
in the following for "Maintenance I" and
"Maintenance II." Generally, it is recommended
that your first service be Maintenance I, your
second service be Maintenance II, and that you
alternate Maintenance I and Maintenance II
thereafter. However, in some cases,
Maintenance II may be required more often.
Change engine oil and filter. See Engine Oil on page 397. Reset oil life system.
See Engine Oil Life System on page 400. An Emission Control Service.
Visually check for any leaks or damage. See footnote (g).
Inspect engine air cleaner filter. If necessary, replace filter. See Engine Air
Cleaner/Filter on page 402. See footnote (l).
Rotate tires and check inflation pressures and wear. See Tire Inspection and
Rotation on page 448 and "Tire Wear Inspection" in At Least Once a Month on
page 508.
Inspect brake system. See footnote (a).
Check engine coolant and windshield washer fluid levels and add fluid as
needed.
Maintenance I — Use Maintenance I if the
CHANGE ENGINE OIL SOON message comes on
within 10 months since the vehicle was purchased
or Maintenance II was performed.
Maintenance II — Use Maintenance II if the
previous service performed was Maintenance I.
Always use Maintenance II whenever the message
comes on 10 months or more since the last
service or if the message has not come on at all
for one year.
Scheduled Maintenance
Service Maintenance I Maintenance II
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